RTF malware analysis — malicious · 3c54d563a2b9c78a

MALICIOUS

RTF

12.9 KB First seen: 2020-02-04

MD5: ad556e0f65a6804c70c9703fea7a5e76 SHA-1: 9ad0ed4f181f9f5a3a5fdd83892c4f160d2b1ace SHA-256: 3c54d563a2b9c78a35d84903361c685d7d14f96d2c4ffb66b78e75e5b653363f

180 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object with an Equation Editor CLSID, which is a known vulnerability vector. The \objupdate directive forces the activation of this object, leading to the execution of embedded shellcode. The extracted artifact 'objdata_00_off0000114e.bin' is flagged as a potential shellcode candidate, strongly suggesting the file's purpose is to exploit this vulnerability for initial execution.

Heuristics 5

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM

RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
\objupdate forces OLE activation high RTF_OBJUPDATE

RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
OLE object data medium RTF_OBJDATA

RTF contains 1 \objdata section(s) — embedded OLE objects
Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000114e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x114E	4159 bytes
SHA-256: `614f84bc2b6a88740447d28f9896536ad45464cb18e16150d2723e101cee1ef3`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL

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